I don't know this xtra (DataSafe), but was it compiled for D11+, or for D10 and below? Otherwise, it won't be unicode aware and will perhaps struggle with high ASCII characters (which appears to be your problem). Where in your process is this xtra involved (you refer to decryption). Is there another xtra you could use? How dependent are you on encrypting/decrypting data? Have you tried another xtra, like Valentin's crypto xtra?

Check if the XML header (<?xml version="1.0" encoding="UTF-8"?>) and XML file encoding is UTF-8. Many text editors set file encoding to ANSI (or other non UTF or Unicode format) by default. If you are working on Windows open your XML file in Notepad and “Save As” with UTF-8 encoding. I used to have the same problem some years ago. Buddy File is a great and easy file Xtra and has BlowFish encryption functions.